The brokerage houses support the sector with constant rises in valuations. But his departure is linked to a price of crude oil, whose evolution depends on exogenous factors.

The oil giant Chevron lost 6.7% of its value on the stock market last Monday, equivalent to 22,477 million dollars (21,324 million euros) of capitalization, almost the same as Repsol is worth. For investors who owned shares of the comp